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Segment Reporting - Sales by Business Segment (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Revenue from External Customer [Line Items] |  |  |  |
Revenues | $ 128,865 | $ 109,875 | $ 248,101 | $ 213,823
Operating Income (Loss) | 7,384 | 6,780 | 13,873 | 8,537
Cardiovascular Segment |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 124,669 | 105,953 | 239,576 | 205,707
Operating Income (Loss) | 7,300 | 6,649 | 13,696 | 8,277
Endoscopy Segment |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 4,196 | 3,922 | 8,525 | 8,116
Operating Income (Loss) | $ 84 | $ 131 | $ 177 | $ 260

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